The invention relates to an electrode collecting EEG signals; the electrode comprises an electrode body; the electrode body is hollow, and the internal diameter of the upper cavity of the hollow portion is bigger than that of the lower cavity of the hollow portion; the periphery on top of the electrode body is provided with a groove; the periphery of a conductive liquid sinking storage device is provided with a conductive liquid sinking storage device cover; the conductive liquid sinking storage device cover is fixed on the groove through a O-shape ring; the periphery on the bottom of the electrode body is provided with a wire slot; a wire is welded in the wire slot; an electrode shield is arranged outside the electrode body; the bottom of the electrode shield is provided with a through hole, wherein the internal diameter of the through hole is same with that of the lower cavity of the hollow portion; the electrode shield and electrode body are fixed by a fixing device; the side edge on the bottom of the electrode shield is provided with a wire hole allowing the wire to pass; the conductive liquid sinking storage device cover is slightly higher than the top edge of the electrode shield. The electrode structure can be improved so as to directly pour conductive liquid into the conductive liquid sinking storage device, thus eliminating discomfort caused by a conventional dry type electrode invading the scalp, and eliminating discomfort caused by a wet type electrode pasted on the patient scalp.